	adaptive(document, window);//初始加载自适应
	function adaptive(doc, win) {
		var docEl = doc.documentElement,
		resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
		recalc = function() {
			var clientWidth = docEl.clientWidth;
			if(!clientWidth) return;
			if(clientWidth >= 1920) {
				docEl.style.fontSize = '70px';//这个是根据我自己项目调的
			} else {
				docEl.style.fontSize = 100 * (clientWidth / 1920) + 'px';
			}
		};
		if(!doc.addEventListener) return;
		        win.addEventListener(resizeEvt, recalc, false);
			doc.addEventListener('DOMContentLoaded', recalc, false);
		}
		//随浏览器大小自适应
		window.onresize = function() {
		adaptive(document, window);
	}


